Battery piece front side single welding system and method of photovoltaic server

Abstract

The invention relates to the technical field of single welding of photovoltaic cells, and discloses a system and method for single welding of the front face of a cell of a photovoltaic server. The system comprises a rotationally-arranged circular welding table, and a plurality of welding stations are evenly distributed on the top face of the circular welding table in the circumferential direction; a welding strip feeding mechanism and a welding strip welding mechanism are sequentially arranged on the circular welding table in the rotating direction of the circular welding table, the welding strip feeding mechanism comprises a welding strip feeding box, the welding strip feeding box is located over the welding station, and a plurality of welding strip feeding cavities are formed in the bottom of the welding strip feeding box at equal intervals; the multiple welding strip feeding cavities correspond to main grid lines on the front faces of battery pieces one to one, and the welding strip feeding box has the freedom degree of moving in the axial direction of the circular welding table and the freedom degree of moving in the horizontal direction. The welding strip welding mechanism comprises a welding base, the welding base is located over the welding station, a plurality of welding bosses are arranged at the bottom of the welding base, and electric heating wires are arranged in the welding bosses. Full-automatic single welding of the battery piece is achieved, and production efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of single-welding of photovoltaic cells, and in particular to a system and method for single-welding the front side of a cell of a photovoltaic server. Background Art

[0002] As the photovoltaic industry and data centers converge, the quality of the soldering of photovoltaic server cells, core equipment that combines power supply and data processing functions, directly impacts system stability and energy efficiency. Compared to conventional photovoltaic cells, photovoltaic server cells must not only meet high conversion efficiency requirements but also adapt to the server's compact footprint, high heat dissipation requirements, and long-term stable operation. Therefore, more stringent standards are imposed on the single soldering process between the front busbar and the tinned copper ribbon. The quality of both the front-side single soldering and the back-side string soldering is crucial. Since the design service life of solar modules is about 25 years, and the modules are usually installed outdoors, they have to withstand temperature changes of dozens of degrees Celsius every day. The base material of the welding ribbon is pure copper, and the expansion coefficient of copper is about 6 times that of silicon (cell). As long as there is a temperature change, the welding ribbon and the cell will be stressed. Therefore, poor welding will cause the module to fail in serious cases. The welding process of solar cells is as follows: First, perform single welding on the front side. Use an electric soldering iron to weld the tinned copper welding ribbon to the main grid line of the front (negative) of the cell at a certain temperature; then perform string welding on the back side of the cell. On a special welding template (can be To ensure the relative position of the battery cells), the interconnection strips are welded to the electrodes on the back of the battery cells, thereby connecting the battery cells together in series, and the positive and negative electrodes are welded with lead wires. At present, a stringing machine is introduced to connect the battery cells in series, but the single welding of solar cells is mainly completed by manual welding. Manual operation is used to ensure the positioning accuracy of the welding and control the fragmentation rate to less than 0.3%. Although the output can be guaranteed, the manual operation process cannot improve work efficiency and the production efficiency is low. Moreover, the manual welding method has high requirements for the operator and it is not easy to control the quality of the product. Summary of the Invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a system and method for single-welding the front side of a photovoltaic server cell, thereby realizing fully automatic single-welding of the cell, reducing labor costs and greatly improving production efficiency.

[0004] The purpose of the present invention is achieved through the following technical solutions: a photovoltaic server cell front single welding system, comprising a rotatable circular welding table, the top surface of the circular welding table is provided with a plurality of welding stations, the plurality of welding stations are evenly distributed along the circumferential direction of the circular welding table, the circular welding table is sequentially provided with a welding strip feeding mechanism and a welding strip welding mechanism along its own rotation direction, the welding strip feeding mechanism comprises a welding strip feeding box and a limiting bearing plate, the welding strip feeding box is located directly above the welding station, the bottom of the welding strip feeding box is provided with a plurality of welding strip feeding cavities at equal intervals, and the plated The tin-copper soldering strips are stacked in sequence in the soldering strip loading cavity along the height direction of the soldering strip loading box. A plurality of the soldering strip loading cavities correspond one-to-one to the main grid lines on the front of the solar cell. The soldering strip loading box has the freedom to move axially along the circular soldering table and the freedom to move horizontally. The horizontal movement freedom of the soldering strip loading box is parallel to the length direction of the main grid lines. One end of each of the soldering strip loading cavities is provided with the limiting bearing plate, which is contacted with the bottom of the soldering strip loading box and has the freedom to move axially along the circular soldering table.

[0005] The welding ribbon welding mechanism includes a welding seat, which is located directly above the welding station. A plurality of welding bosses are provided at the bottom of the welding seat. The plurality of welding bosses correspond one-to-one to the plurality of main grid lines on the battery cell, and an electric heating wire is provided in the welding boss.

[0006] In some embodiments, the welding strip feeding mechanism also includes a feeding frame, a vertical cylinder and a horizontal cylinder, the feeding frame is located on one side of the circular welding table, the feeding frame is fixed with a top plate, the cylinder body of the vertical cylinder is installed on the top plate, the telescopic shaft of the vertical cylinder is fixed with an inverted T-shaped block, the top of the welding strip feeding box is provided with an inverted T-shaped slot along the telescopic direction of the horizontal cylinder, the inverted T-shaped block is slidably adapted in the inverted T-shaped slot, a T-shaped slide rail is vertically fixed on the feeding frame, and a sliding seat is slidably adapted on the T-shaped slide rail, the cylinder body of the horizontal cylinder is installed on the slide, the telescopic shaft of the horizontal cylinder is connected to a mounting plate, and the mounting plate is connected to the welding strip feeding box by bolts, the welding strip welding mechanism also includes a welding frame, a welding cylinder is vertically installed on the welding frame, the telescopic shaft of the welding cylinder is connected to a mounting plate, and the mounting plate is connected to the welding seat by welding bolts.

[0007] In some embodiments, both inner walls of the solder strip loading cavity in the length direction are slidably provided with a supporting plate, and the supporting plate moves along the length direction of the solder strip loading cavity. A driving block is fixed to the side walls at both ends of the solder strip loading box, and a driving cavity is provided in the driving block. One end of the supporting plate is movably inserted into the driving cavity and is fixedly sleeved with a spring mounting plate. An electromagnet is provided in the driving cavity, and a permanent magnet is fixed on the end of the supporting plate close to the electromagnet. When the electromagnet is energized, a magnetic pole opposite to the magnetic pole of the permanent magnet is generated. A spring is sleeved on the supporting plate, and the two ends of the spring are respectively connected to the spring mounting plate and the driving block. When the spring is in normal state, the other end of the supporting plate extends into the solder strip loading cavity.

[0008] In some embodiments, a rectangular groove is provided on the top surface of the limit bearing plate, a lifting plate is slidably arranged in the rectangular groove, and the bottom of the lifting block is connected to the limit bearing plate through a lifting spring. When the lifting spring is in normal state, the top surface of the lifting plate is flush with the top surface of the limit bearing plate, and a lifting electromagnet is provided on the bottom wall of the rectangular groove. A lifting permanent magnet is fixed to the bottom of the lifting plate, and the lifting electromagnet generates a magnetic pole with the same magnetic property as the lifting permanent magnet when energized.

[0009] In some embodiments, the multiple limiting supporting plates are connected by a cross bar at one end away from the welding strip loading box, a 7-shaped plate is fixed in the middle of the cross bar, and the top of the 7-shaped plate is fixedly sleeved on the telescopic shaft of the vertical cylinder.

[0010] In some embodiments, it also includes a reciprocating loading mechanism and a reciprocating unloading mechanism, the reciprocating loading mechanism, the welding strip loading mechanism, the welding strip welding mechanism and the reciprocating unloading mechanism are arranged in sequence along the rotation direction of the circular welding table, the reciprocating loading mechanism has the same structure as the reciprocating unloading mechanism, but the conveying direction is opposite, the reciprocating loading mechanism includes a conveying table, a conveying plate, a first vertical lifting rod and an unloading mechanism, the conveying table is arranged on one side of the circular welding table, the conveying plate is slidably arranged on the conveying table, the conveying plate moves along the radial direction of the circular welding table, the top surface of the conveying plate is provided with a plurality of battery cell placement stations at equal intervals along its own length direction, the end of the conveying plate is provided with a loading station, and the loading station is closest to the nearest The spacing between the battery cell placement stations is equal to the spacing between two adjacent battery cell placement stations. The loading and unloading mechanism is provided on one side of the loading station. Each battery cell placement station is correspondingly provided with the first vertical lifting rod, and the first vertical lifting rod is slidably provided on the conveying table. The first vertical lifting rod moves along the axial direction of the circular welding table. A strip groove for the first vertical lifting rod to pass through is provided on the conveying plate. A rectangular welding table is fixed at the welding station of the circular welding table. A rectangular welding groove is provided on the top surface of the rectangular welding table. A plurality of second vertical lifting rods are slidably passed through the rectangular welding groove. The plurality of second vertical lifting rods are evenly distributed on both sides of the conveying plate.

[0011] In some embodiments, a driving mounting plate is fixed on both sides of the top of the conveying platform, and a rodless cylinder is installed on the inner side of the driving mounting plate, and both sides of the conveying plate are respectively fixedly connected to the cylinder slides of the two rodless cylinders, and the rodless cylinder is provided with a first mechanical limit block at both ends of the cylinder slide, a cavity is provided in the conveying platform, a driving cross plate is provided in the cavity, the bottom end of the first vertical lifting rod is fixedly connected to the driving cross plate, the first lifting cylinder is provided in the cavity, the cylinder body of the first lifting cylinder is installed on the conveying platform, and the telescopic shaft of the first lifting cylinder is connected to the driving cross plate, the circular welding platform is provided with a lifting cavity directly below each of the rectangular welding platforms, a rectangular lifting plate is provided in the lifting cavity, the bottom end of the second vertical lifting rod is fixedly connected to the rectangular lifting plate, and a second lifting cylinder is vertically provided in the lifting cavity, the cylinder body of the second lifting cylinder is connected to the circular welding platform, and the telescopic shaft of the second lifting cylinder is connected to the rectangular lifting plate.

[0012] In some embodiments, the loading and unloading mechanism includes a gantry, a rectangular material box, and a negative pressure feeding pipe. The gantry is in the shape of a "冂" character. Both the conveying table and the rectangular material box are located within the opening of the gantry. A lead screw is rotatably connected to the gantry. The lead screw is perpendicular to the conveying table. A lead screw slider is threadedly sleeved on the lead screw. The lead screw slider is in sliding contact with the gantry. Two second mechanical limit blocks are fixedly spaced on the gantry. The lead screw slider is located between the two second mechanical limit blocks. The second mechanical limit blocks are on the moving path of the lead screw slider. A feeding cylinder is vertically arranged at the bottom of the lead screw slider. The telescopic shaft of the feeding cylinder is connected to the negative pressure feeding pipe. A motor is arranged on the gantry. The output shaft of the motor is drivingly connected to the lead screw. A rectangular stacking groove is formed at the top of the rectangular material box. The photovoltaic cells are stacked in the rectangular stacking groove along the height direction of the rectangular material box. A lifting bottom plate is arranged in the rectangular stacking groove. A linear driving module is vertically arranged on the outer wall of the rectangular material box. The linear slider of the linear driving module is connected to the lifting bottom plate through a connecting rod.

[0013] In some embodiments, both the first vertical lifting rod and the second vertical lifting rod are hollow. A first negative pressure pump is arranged in the cavity. The first vertical lifting rod is connected to the first negative pressure pump through a first air pipe. A negative pressure cavity is arranged in the conveying plate. A plurality of negative pressure holes are evenly formed on the top surface of the conveying plate along its length direction. The negative pressure holes communicate with the negative pressure cavity. The conveying plate is connected to the first negative pressure pump through a negative pressure hose. The negative pressure hose communicates with the negative pressure cavity. A second negative pressure pump is arranged in the lifting cavity. The second vertical lifting rod is connected to the second negative pressure pump through a second air pipe; A main shaft is coaxially fixed at the bottom of the circular welding table. One end of the main shaft away from the circular welding table is rotatably connected to a base. A main driving cavity is arranged in the base. A stepping motor is arranged in the main driving cavity. A first gear is arranged on the output shaft of the stepping motor. A second gear is sleeved on the main shaft. The second gear meshes with the first gear.

[0014] A method for single-sided front welding of battery chips of a photovoltaic server, using the above-mentioned single-sided front welding system for battery chips of a photovoltaic server, includes the following steps:

[0015] S1. Feed the battery chips to the welding station through the reciprocating loading and unloading mechanism;

[0016] S2. Move the welding station carrying the battery chips to the station of the welding tape feeding mechanism;

[0017] S3. The welding tape feeding box moves close to the battery chips, and the tin-plated copper welding tape is placed corresponding to the main grid line of the battery chips in the welding tape feeding cavity;

[0018] S4. After the tin-plated copper welding tape is placed, it runs to the welding tape welding mechanism;

[0019] S5. The welding seat moves closer to the battery cell and makes the welding boss contact each tinned copper soldering strip accordingly. The tinned copper soldering strip and the battery cell are heated by the electric heating wire in the welding boss so that the tin on the tinned copper soldering strip melts and condenses on the battery cell, completing the welding operation.

[0020] The beneficial effects of the present invention are:

[0021] 1. The reciprocating feeding mechanism places the battery cells in the rectangular welding groove of the rectangular welding table in turn. The circular welding table rotates the battery cells to the welding ribbon feeding mechanism and the welding ribbon welding mechanism in turn. The welding ribbon feeding mechanism places the tinned copper welding ribbon on the main grid line of the battery cell. The welding ribbon welding mechanism then welds the tinned copper welding ribbon to the battery cell. Finally, the reciprocating unloading mechanism takes the welded battery cell out of the rectangular welding groove, thereby completing the automatic loading, automatic welding and automatic unloading of the battery cell, realizing fully automatic single welding of the battery cell, reducing labor costs and greatly improving production efficiency.

[0022] 2. It has high loading and unloading accuracy, so that the battery cells can accurately correspond to the tinned copper welding strips, and can accurately control the welding quality of the battery cells, which greatly reduces the defective product rate compared with manual welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A three-dimensional schematic diagram of a single-welding system for the front side of a photovoltaic server according to the present invention Figure 1 ;

[0024] Figure 2 A three-dimensional schematic diagram of a single-welding system for the front side of a photovoltaic server according to the present invention Figure 2 ;

[0025] Figure 3 A three-dimensional schematic diagram of a single-solder front welding system for a photovoltaic server according to the present invention Figure 3 ;

[0026] Figure 4 A three-dimensional schematic diagram of a single-solder front welding system for a photovoltaic server according to the present invention Figure 4 ;

[0027] Figure 5 for Figure 4 Enlarged view of point A in the middle;

[0028] Figure 6 This is a schematic diagram of the internal structure of a welding ribbon loading box in a single welding system for the front side of a photovoltaic server according to the present invention;

[0029] Figure 7This is a schematic diagram of the working state of the solder ribbon loading box and the limiting load plate in the single front soldering system of the solar cell of a photovoltaic server according to the present invention;

[0030] Figure 8 This is a schematic diagram of the internal structure of a conveyor platform in a single-front welding system for solar cells of a photovoltaic server according to the present invention;

[0031] Figure 9 This is a schematic diagram of the internal structure of a circular welding table in a single welding system for the front side of a photovoltaic server according to the present invention;

[0032] Figure 10 for Figure 9 Enlarged view of point B in the middle;

[0033] In the figure, 1-circular welding table, 2-feeding frame, 3-welding strip feeding box, 4-limiting bearing plate, 5-welding strip feeding cavity, 6-welding seat, 7-welding boss, 8-vertical cylinder, 9-horizontal cylinder, 10-top plate, 11-inverted T-shaped block, 12-inverted T-shaped groove, 13-T-shaped slide rail, 14-slide seat, 15-mounting plate, 16-welding frame, 17-welding cylinder, 18-mounting piece, 19-bearing plate, 20-driving block, 21-driving cavity, 22-spring mounting plate, 23-electromagnet, 24-permanent magnet, 25-spring, 26-rectangular groove, 27-lifting plate, 28-lifting spring, 29-lifting electromagnet, 30-lifting permanent magnet, 31-cross bar, 32-7-shaped plate, 33-conveyor table, 34-conveyor plate, 35-first vertical lifting rod, 36-bar Slot, 37-rectangular welding table, 38-rectangular welding slot, 39-second vertical lifting rod, 40-drive mounting plate, 41-rodless cylinder, 42-first mechanical limit block, 43-drive cross plate, 44-first lifting cylinder, 45-rectangular lifting plate, 46-second lifting cylinder, 47-gantry, 48-rectangular material frame, 49-negative pressure feeding pipe, 50-screw, 51-screw slide, 52-feeding cylinder, 53-motor, 54-linear drive module, 55-lifting bottom plate, 56-first negative pressure pump, 57-first air pipe, 58-second negative pressure pump, 59-second air pipe, 60-second mechanical limit block, 61-spindle, 62-base, 63-stepping motor, 64-first gear, 65-second gear, 66-connecting rod, 67-negative pressure hole, 68-negative pressure hose. DETAILED DESCRIPTION

[0034] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings, but the protection scope of the present invention is not limited to the following.

[0035] like Figures 1 to 10As shown, a single welding system for the front side of a solar cell of a photovoltaic server comprises a rotatable circular welding table 1, a top surface of the circular welding table 1 is provided with a plurality of welding stations, and the plurality of welding stations are evenly distributed along the circumferential direction of the circular welding table 1, and the circular welding table 1 is sequentially provided with a welding strip feeding mechanism and a welding strip welding mechanism along its own rotation direction, and the solar cells are sequentially sent to the welding strip feeding mechanism for placing the tinned copper welding strip and welding the tinned copper welding strip at the welding strip welding mechanism through the rotation of the circular welding table 1, and the circular welding table 1 rotates intermittently, and each rotation angle is equal to the angle between two adjacent welding stations, so that each welding station can be deflected to the welding strip feeding mechanism and the welding strip welding mechanism for processing, and the welding strip feeding mechanism comprises a welding strip feeding box 3 and a limiting bearing plate 4, the welding strip feeding box 3 is located directly above the welding station, and a plurality of welding strip feeding cavities 5 are evenly spaced at the bottom of the welding strip feeding box 3, and the tinned copper welding strips are stacked in sequence on the welding strip feeding mechanism along the height direction of the welding strip feeding box 3. The tinned copper strips are placed neatly in the welding strip loading box 3. Each main grid line on the battery cell corresponds to a welding strip loading cavity 5, so that the tinned copper strips are loaded on each main grid line at the same time, thereby improving processing efficiency. Multiple welding strip loading cavities 5 correspond to the main grid lines on the front of the battery cell one by one. The welding strip loading box 3 has the freedom to move axially along the circular welding table 1 and the freedom to move horizontally, so that the welding strip loading box 3 is vertically close to the battery cell, so that the tinned copper strips fall accurately on the main grid lines of the battery cell, and then the welding strip loading box 3 is horizontally moved and separated from the battery cell. The horizontal movement freedom of the welding strip loading box 3 is parallel to the length direction of the main grid lines. A limiting bearing plate 4 is provided at one end of each welding strip loading cavity 5, and the limiting bearing plate 4 is contacted and arranged at the bottom of the welding strip loading box 3. The limiting bearing plate 4 has the freedom to move axially along the circular welding table 1.The ribbon welding mechanism includes a welding seat 6, which is located just above the welding station. A plurality of welding bosses 7 are provided at the bottom of the welding seat 6. The plurality of welding bosses 7 correspond one to one with the plurality of main grid lines on the battery cell. An electric heating wire is provided in the welding boss 7. The mechanism also includes a reciprocating feeding mechanism and a reciprocating unloading mechanism. The reciprocating feeding mechanism, the ribbon feeding mechanism, the ribbon welding mechanism and the reciprocating unloading mechanism are sequentially arranged along the rotation direction of the circular welding table 1. The reciprocating feeding mechanism has the same structure as the reciprocating unloading mechanism, but the conveying direction is opposite. The opposite conveying direction here means that when the reciprocating feeding mechanism places the battery cell on the welding station, the reciprocating unloading mechanism will place the battery cell on the welding station. The battery cells are removed, and the specific single welding process is as follows: the empty welding station first runs to the loading station of the reciprocating loading mechanism, and the battery cells are loaded to the welding station through the reciprocating loading mechanism. Then, the welding station carrying the battery cells runs to the station of the soldering strip loading mechanism. At this time, the next empty welding station runs to the loading station of the reciprocating loading mechanism to load the battery cells, and the battery cells at the soldering strip loading mechanism are placed with tinned copper soldering strips. The soldering strip loading box 3 moves close to the battery cells, and the soldering strip loading cavity 5 puts the tinned copper soldering strip on the main grid line of the battery cell, so that the tinned copper soldering strip is placed on each main grid line at the same time. After the tinned copper soldering strip is placed, it runs to the soldering strip welding mechanism. At the same time, the next welding station carrying the battery cell runs to the welding tape feeding mechanism to place the tinned copper welding tape, and the battery cell at the welding tape welding mechanism is welded with the tinned copper welding tape, and the welding seat 6 moves close to the battery cell, and makes the welding boss 7 contact each tinned copper welding tape accordingly, and the tinned copper welding tape and the battery cell are heated by the electric heating wire in the welding boss 7, so that the tin on the tinned copper welding tape is melted and condensed on the battery cell, thereby completing the welding operation. The battery cell does not directly contact the welding boss 7, and while meeting the heating requirements, there will be no overheating, which can protect the battery cell from damage during the welding process. The welded battery cell runs to the reciprocating unloading mechanism, and The next battery cell with the tinned copper soldering strip placed on it moves to the soldering strip welding mechanism for welding. The reciprocating unloading mechanism takes out the welded battery cell, leaving the welding station vacant and moves to the reciprocating loading mechanism for loading the battery cell. Thus, the loading of the battery cell, the placement of the tinned copper soldering strip, the welding of the tinned copper soldering strip, and the unloading of the battery cell are carried out simultaneously, but on different battery cells. This greatly improves the production effect for the batch production of the corresponding battery cells. At the same time, the entire welding process is fully automatic, which greatly reduces the labor cost. A single welding method is provided accordingly. Each welding work cycle performs the following steps to realize the automated front-side single welding production of the battery cell, specifically:

[0036] A method for single front welding of solar cells of a photovoltaic server, using the above-mentioned single front welding system for solar cells of a photovoltaic server, includes the following steps:

[0037] S1. Load the battery cells to the welding station through the reciprocating loading mechanism;

[0038] S2, the welding station carrying the battery cell moves to the station of the welding ribbon loading mechanism;

[0039] S3, the solder ribbon loading box 3 moves close to the battery cell, and the solder ribbon loading cavity 3 places the tinned copper solder ribbon corresponding to the main grid line of the battery cell;

[0040] S4, after the tinned copper welding strip is placed, it moves to the welding strip welding mechanism;

[0041] S5. The welding seat 6 moves closer to the battery cell, and the welding boss 7 contacts each tinned copper soldering strip accordingly. The tinned copper soldering strip and the battery cell are heated by the electric heating wire in the welding boss 7, so that the tin on the tinned copper soldering strip melts and condenses on the battery cell, completing the welding operation.

[0042] Furthermore, if Figure 10 As shown, a main shaft 61 is coaxially fixed to the bottom of the circular welding table 1, and the end of the main shaft 61 away from the circular welding table 1 is rotatably connected to the base 62. A main drive cavity is provided in the base 62, and a stepper motor 63 is provided in the main drive cavity. The output shaft of the stepper motor 63 is provided with a first gear 64, and a second gear 65 is mounted on the main shaft 61. The second gear 65 engages with the first gear 64. The stepper motor 63 drives the main shaft 61 to rotate through the engagement of the first gear 64 and the second gear 65. The main shaft 61 drives the circular welding table 1 to rotate. The stepper motor 63 has a precise deflection angle, which can ensure that the deflection angle is consistent each time, so that the single welding of the battery cell has better welding quality.

[0043] In some embodiments, as Figures 1 to 6As shown, the welding strip feeding mechanism also includes a feeding frame 2, a vertical cylinder 8 and a horizontal cylinder 9. The feeding frame 2 is located on one side of the circular welding table 1. A top plate 10 is fixed on the feeding frame 2. The cylinder body of the vertical cylinder 8 is installed on the top plate 10. The telescopic axis of the vertical cylinder 8 is fixed with an inverted T-shaped block 11. An inverted T-shaped groove 12 is opened on the top of the welding strip feeding box 3 along the telescopic direction of the horizontal cylinder 9. The inverted T-shaped block 11 slides and fits in the inverted T-shaped groove 12. A T-shaped slide rail 13 is vertically fixed on the feeding frame 2. A slide seat 14 is slidingly fitted on the T-shaped slide rail 13. The cylinder body of the horizontal cylinder 9 is installed on the slide seat 14. The telescopic axis of the horizontal cylinder 9 is connected with a mounting plate 15, and the mounting plate 15 is connected to the On the welding strip loading box 3, the welding strip welding mechanism also includes a welding frame 16, and a welding cylinder 17 is vertically installed on the welding frame 16. The telescopic shaft of the welding cylinder 17 is connected to the mounting piece 18, and the mounting piece 18 is connected to the welding seat 6 by welding bolts. The two inner walls of the welding strip loading chamber 5 in the length direction are slidably provided with a carrying plate 19, and the carrying plate 19 moves along the length direction of the welding strip loading chamber 5. Since the opening of the welding strip loading chamber 5 is facing downward, the tinned copper welding strip will fall from the opening of the welding strip loading chamber 5 under the action of its own gravity. In order to prevent the tinned copper welding strip from falling when the tinned copper welding strip is not placed, the carrying plate 19 is used to prevent the tinned copper welding strip from falling. One end of the carrying plate 19 extends into the welding strip loading chamber 5, and through the two The supporting plates 19 support the two ends of the tinned copper soldering strip in the length direction, thereby preventing the tinned copper soldering strip from falling. When the battery cell runs to the bottom of the soldering strip loading box 3, the vertical cylinder 8 drives the soldering strip loading box 3 to move close to the battery cell, so that the soldering strip loading box 3 is the thickness of a tinned copper soldering strip away from the battery cell. Then the supporting plate 19 is moved out of the soldering strip loading cavity 5, so that the tinned copper soldering strip falls on the main grid line of the battery cell. The tinned copper soldering strip that falls on the battery cell prevents the tinned copper soldering strip above from continuing to fall. Then the horizontal cylinder 9 drives the soldering strip loading box 3 to move close to the limiting supporting plate 4, so that the soldering strip loading box 3 moves to the limiting supporting plate 4. Since the limiting supporting plate 4 is in contact with the bottom of the soldering strip loading box 3, The tinned copper soldering strip in the soldering strip loading chamber 5 is thereby prevented from falling by the limiting supporting plate 4, ensuring that only one tinned copper soldering strip is loaded on a main grid line at a time, and the remaining tinned copper soldering strips can be stably stacked in the soldering strip loading chamber 5. When the soldering strip loading box 3 moves onto the limiting supporting plate 4, the soldering strip loading box 3 is separated from the battery cell. At this time, the circular welding table 1 continues to drive the battery cell to rotate to the soldering strip welding mechanism for welding operation, thereby completing the operation of placing the tinned copper soldering strip on multiple main grid lines of the battery cell at the same time, thereby improving efficiency, and the supporting plate 19 is reset to continue to support the tinned copper soldering strip. Finally, the vertical cylinder 8 and the horizontal cylinder 9 drive the soldering strip loading box 3 to reset and wait for operation on the next battery cell.It is worth noting that when the vertical cylinder 8 drives the welding strip loading box 2 to move up and down, it also drives the horizontal cylinder 9 to move up and down. The sliding adaptation of the slide 14 and the T-shaped slide rail 13 makes the horizontal cylinder 9 move smoothly. When the horizontal cylinder 9 drives the welding strip loading box 3 to move, the welding strip loading box 3 and the vertical cylinder 8 will produce relative movement, and the cooperation of the inverted T-shaped block 11 and the inverted T-shaped groove 12 completes the installation of the vertical cylinder 8 and the welding strip loading box 3, and also makes the welding strip loading box 3 can move with the extension and contraction of the horizontal cylinder 9, so that there will be no interference between the two degrees of freedom of movement of the welding ribbon loading box 3. When the tinned copper welding ribbon in the welding ribbon loading box 3 is used up, the welding bolts on the mounting plate 18 are removed, and then the welding ribbon loading box 3 is slid along the length direction of the inverted T-shaped groove 12 to separate the inverted T-shaped block 11 from the inverted T-shaped groove 12, thereby removing the welding ribbon loading box 3 and replacing it with a new welding ribbon loading box 3 filled with tinned copper welding ribbon.

[0044] In some embodiments, as Figures 1 to 7As shown, since the installation of the carrying plate 19 occupies a certain space, when the soldering ribbon loading box 3 places the tinned copper soldering ribbon on the battery cell, the tinned copper soldering ribbon above it is flush with the bottom surface of the soldering ribbon loading box 3. At this time, the resetting of the carrying plate 19 will interfere with the tinned copper soldering ribbon. For this reason, the side walls of both ends of the soldering ribbon loading box 3 are fixed with driving blocks 20, and a driving cavity 21 is provided in the driving block 20. One end of the carrying plate 19 is movably inserted into the driving cavity 21 and is fixedly sleeved with a spring mounting plate 22. An electromagnet 23 is provided in the driving cavity 21. A permanent magnet 24 is fixed to the end of the carrying plate 19 close to the electromagnet 23. 23 is energized to generate a magnetic pole opposite to the magnetic field of the permanent magnet 24. A spring 25 is sleeved on the carrier plate 19. The two ends of the spring 25 are respectively connected to the spring mounting plate 22 and the driving block 20. When the spring 25 is in normal state, the other end of the carrier plate 19 extends into the solder strip loading cavity 5. When the tinned copper solder strip is below, the electromagnet 23 is energized to attract the permanent magnet 24. The permanent magnet 24 drives the carrier plate 19 to compress the spring 25 and move, thereby moving the carrier plate 19 out of the solder strip loading cavity 5, so that the tinned copper solder strip can fall smoothly. A rectangular groove 26 is opened on the top surface of the limiting carrier plate 4, and a lifting plate 27 is slidably provided in the rectangular groove 26. The bottom of the lifting block 27 is connected to the limit bearing plate 4 through the lifting spring 28. When the lifting spring 28 is in normal state, the top surface of the lifting plate 27 is flush with the top surface of the limit bearing plate 4. The bottom wall of the rectangular groove 26 is provided with a lifting electromagnet 29. A lifting permanent magnet 30 is fixed to the bottom of the lifting plate 27. The lifting electromagnet 29 is energized to generate a magnetic pole with the same magnetic property as the lifting permanent magnet 30. When the welding strip loading box 3 contacts the limit bearing plate 4, the lifting electromagnet 29 is energized to repel the lifting permanent magnet 30, so that the lifting plate 27 stretches the lifting spring 28 to move upward, and the lifting plate 27 will lift the tinned copper welding strip to rise. The height of the lowest tinned copper soldering strip is higher than the height of the supporting plate 19. At this time, the electromagnet 23 is powered off, and the supporting plate 19 is reset under the reaction force of the spring 25, so that the supporting plate 19 extends into the soldering strip loading cavity 5. The length of the lifting plate 27 is less than the length of the soldering strip loading cavity 5, so that the supporting plate 19 will not interfere with the lifting plate 27 after it is reset. Then, the lifting electromagnet 29 is powered off, and the lifting plate 27 is reset under the reaction force of the lifting spring 28, so that the tinned copper soldering strip falls back on the supporting plate 19, ensuring that the tinned copper soldering strip will not fall out of the soldering strip loading cavity 5. Finally, the soldering strip loading box 3 is reset and waits for the next operation.

[0045] Furthermore, if Figures 1 to 5As shown, multiple limiting supporting plates 4 are connected at one end away from the welding strip feeding box 3 through a cross bar 31, and a 7-shaped plate 32 is fixed to the middle of the cross bar 31. The top of the 7-shaped plate 32 is fixedly sleeved on the telescopic shaft of the vertical cylinder 8. The limiting supporting plate 4 is connected to the telescopic shaft of the vertical cylinder 8 through the cross bar 31 and the 7-shaped plate 32, so that the vertical cylinder 8 drives the welding strip feeding box 3 and the limiting supporting plate 4 to move at the same time, but when the horizontal cylinder 9 is actuated, it only drives the welding strip feeding box 3 to move, so that the limiting supporting plate 4 is always in contact with the bottom surface of the welding strip feeding box 3, and can stably carry the remaining tinned copper welding strips after the tinned copper welding strip below.

[0046] In some embodiments, as Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 8As shown, the reciprocating loading mechanism includes a conveyor table 33, a conveyor plate 34, a first vertical lifting rod 35 and a loading and unloading mechanism. The conveyor table 33 is arranged on one side of the circular welding table 1, and the conveyor plate 34 is slidably arranged on the conveyor table 33. The conveyor plate 34 moves along the radial direction of the circular welding table 1. The top surface of the conveyor plate 34 is provided with a plurality of battery cell placement stations at equal intervals along its own length direction. A loading station is provided at the end of the conveyor plate 34. The distance between the loading station and the nearest battery cell placement station is equal to the distance between the two adjacent battery cell placement stations. A loading and unloading mechanism is provided on one side of the loading station. Each cell placement station is provided with a first vertical lifting rod 35, which is slidably arranged on the conveying platform 33. The first vertical lifting rod 35 moves along the axial direction of the circular welding platform 1. A strip groove 36 for the first vertical lifting rod 35 to pass through is opened on the conveying plate 34. A rectangular welding platform 37 is fixed at the welding station of the circular welding platform 1. A rectangular welding groove 38 is opened on the top surface of the rectangular welding platform 37. A plurality of second vertical lifting rods 39 are slidably passed through the rectangular welding groove 38. The plurality of second vertical lifting rods 39 are evenly distributed on both sides of the conveying plate 34. The setting of the rectangular welding platform 37 leaves space between the top surface of the rectangular welding platform 37 and the circular welding platform 1, which is convenient for arranging the limiting carrier plate 4. When placing the tinned copper welding strip, the limiting carrier plate 4 will not interfere with the circular welding platform 1. Secondly, the size of the rectangular welding groove 38 matches the size of the battery cell. The battery cell is loaded into the rectangular welding groove 38 for single welding, which makes the positioning of the battery cell more accurate and improves the quality of single welding. The thickness of the rectangular welding groove 38 is equal to the thickness of the battery cell plus the thickness of a tinned copper welding strip. The welding strip loading box 3 moves downward to contact the top surface of the rectangular welding platform 37. The soldering strip feeding cavity 5 is precisely aligned with the main grid line of the battery cell. After the carrying plate 19 is removed, the tinned copper soldering strip falls on the main grid line of the battery cell and is located in the rectangular soldering groove 38. At this time, when the soldering strip feeding box 3 moves close to the limiting carrying plate 4, the tinned copper soldering strip on the battery cell will not be moved due to the limitation of the rectangular soldering groove 38, thereby ensuring that the tinned copper soldering strip falls precisely on the main grid line of the battery cell. The setting of the rectangular soldering groove 38 makes the battery cell welding positioning more accurate and limits the tinned copper soldering strip to prevent the movement of the soldering strip feeding box 3 from driving the movement of the tinned copper soldering strip at the bottom.The automatic loading and unloading process is as follows: the conveyor plate 34 moves close to the circular welding table 1 so that the frontmost battery cell placement station is located directly above the rectangular welding table 37. At this time, the first vertical lifting rod 35 and the second vertical lifting rod 39 move upward at the same time to lift the battery cell. The first vertical lifting rod 35 lifts the battery cell on the rectangular welding table 37. Since the conveyor plate 34 moves forward by a battery cell, the battery cell on the loading station is located directly above the second vertical lifting rod 39 at the rear. The second vertical lifting rod 39 lifts the remaining battery cells. Then, the conveyor plate 34 moves away from the circular welding table 1. The circular welding table 1 moves back to its original position, and the first and second vertical lifting rods 35 and 39 move downward simultaneously. The first vertical lifting rod 35 drives the cell to move into the rectangular welding slot 38, and the second vertical lifting rod 39 drives the cell to fall onto the conveyor plate 34, thereby moving the cell at the rear forward by the distance of one cell placement station. At this time, the loading station is vacant, and the loading and unloading mechanism places the cell on the loading station. After the circular welding table 1 rotates, the conveyor plate 34 moves closer to the circular welding table 1 again to load the cell. This cycle is repeated, realizing the cyclic loading of the cell.

[0047] In some embodiments, as Figures 1 to 4As shown, driving mounting plates 40 are fixed on both sides of the top of the conveying platform 33, and a rodless cylinder 41 is installed on the inner side of the driving mounting plate 40. The two sides of the conveying plate 34 are respectively fixedly connected to the cylinder slides of the two rodless cylinders 41. The conveying plate 34 is driven to move back and forth by the extension and contraction of the rodless cylinder 41. The rodless cylinder 41 is provided with a first mechanical limit block 42 at both ends of the cylinder slide. The moving distance of the conveying plate 34 is accurately positioned by the first mechanical limit block 42, and the cylinder slide stops when it contacts the first mechanical limit block 42. The conveying platform 33 is provided with a cavity, a driving transverse plate 43 is provided in the cavity, the bottom end of the first vertical lifting rod 35 is fixedly connected to the driving transverse plate 43, a first lifting cylinder 44 is provided in the cavity, and the cylinder body of the first lifting cylinder 44 is installed on the conveying platform 33. The driving transverse plate 43 is driven up and down by the first lifting cylinder 44, and the driving transverse plate 43 simultaneously drives multiple first vertical lifting rods 35 to move up and down to complete the battery The jacking operation of the sheet, the telescopic shaft of the first jacking cylinder 44 is connected to the driving horizontal plate 43, the circular welding table 1 is provided with a jacking cavity directly below each rectangular welding table 37, a rectangular jacking plate 45 is provided in the jacking cavity, the bottom end of the second vertical jacking rod 39 is fixedly connected to the rectangular jacking plate 45, a second jacking cylinder 46 is vertically provided in the jacking cavity, the cylinder body of the second jacking cylinder 46 is connected to the circular welding table 1, the telescopic shaft of the second jacking cylinder 46 is connected to the rectangular jacking plate 45, the second jacking cylinder 46 drives the rectangular jacking plate 45 moves up and down, and the rectangular lifting plate 45 simultaneously drives multiple second vertical lifting rods 39 in the rectangular welding groove 38 to move up and down, thereby unloading the battery cell at the front of the conveying plate 34 into the rectangular welding groove 38; and the first vertical lifting rod 35 at the reciprocating unloading mechanism lifts the battery cell from the rectangular welding groove 38 and places it on the conveying plate of the reciprocating unloading mechanism, and the battery cell is transported in turn by the conveying plate, thereby completing the automatic unloading process. The structure of the reciprocating unloading mechanism is the same as that of the reciprocating loading mechanism, and will not be repeated here.

[0048] In some embodiments, as Figures 1 to 4As shown in the figure, the loading and unloading mechanism includes a gantry 47, a rectangular material frame 48 and a negative pressure feeding pipe 49. The gantry 47 is in the shape of a "冂" character. The conveying table 33 and the rectangular material frame 48 are both located inside the opening of the gantry 47. A lead screw 50 is rotatably connected to the gantry 47. The lead screw 50 is perpendicular to the conveying table 33. A lead screw slider 51 is threadedly sleeved on the lead screw 50. The lead screw slider 51 is in sliding contact with the gantry 47. Two second mechanical limit blocks 60 are fixedly arranged on the gantry 47 at intervals. The lead screw slider 51 is located between the two second mechanical limit blocks 60. The second mechanical limit block 60 is located on the moving path of the lead screw slider 51. A feeding cylinder 52 is vertically arranged at the bottom of the lead screw slider 51. The telescopic shaft of the feeding cylinder 52 is connected to the negative pressure feeding pipe 49. A motor 53 is arranged on the gantry 47. The output shaft of the motor 53 is drivingly connected to the lead screw 50. A rectangular stacking groove is formed at the top of the rectangular material frame 48. The photovoltaic cells are stacked in the rectangular stacking groove along the height direction of the rectangular material frame 48. A lifting bottom plate 55 is arranged in the rectangular stacking groove. A linear driving module 54 is vertically arranged on the outer wall of the rectangular material frame 48. The linear slider of the linear driving module 54 is connected to the lifting bottom plate 55 through a connecting rod 66. The motor 53 drives the lead screw 50 to rotate, so that the lead screw slider 51 makes a linear motion along the axial direction of the lead screw 50, and the lead screw slider 51 drives the negative pressure feeding pipe 49 to switch between the feeding station and the rectangular material frame 48. The feeding cylinder 52 drives the negative pressure feeding pipe 49 to extend into the rectangular material frame 48 to adsorb the cells, and then the cells are placed on the feeding station of the conveying plate 34. For each cell fed, the linear driving module 54 drives the lifting bottom plate 55 to rise by the thickness of one cell, so as to lift the cells, enabling the negative pressure feeding pipe 49 to continuously feed the cells in the rectangular material frame 48 onto the conveying plate 34, and then the conveying plate 34 feeds the cells onto the circular welding table 1.

[0049] In some embodiments, such as Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 8As shown, the first vertical lifting rod 35 and the second vertical lifting rod 39 are both hollow, and a first negative pressure pump 56 is provided in the cavity. The first vertical lifting rod 35 is connected to the first negative pressure pump 56 through a first air pipe 57, and the first negative pressure pump 56 generates a negative pressure in the first vertical lifting rod 35. A negative pressure cavity is provided in the conveying plate 34, and a plurality of negative pressure holes 67 are evenly opened on the top surface of the conveying plate 34 along its own length direction. The negative pressure holes 67 are connected to the negative pressure cavity. The conveying plate 34 is connected to the first negative pressure pump 56 through a negative pressure hose 68. The negative pressure hose 68 is connected to the negative pressure cavity. The first negative pressure pump 56 generates a negative pressure in the negative pressure cavity, thereby The hole 67 adsorbs the battery cell, and the first air pipe 57 and the negative pressure hose 68 are both provided with electromagnetic valves, so that the negative pressure action of the first vertical lifting rod 35 and the conveying plate 34 can be performed independently. A second negative pressure pump 58 is provided in the lifting cavity, and the second vertical lifting rod 39 is connected to the second negative pressure pump 58 through the second air pipe 59. In order to ensure that the battery cell can be accurately loaded into the rectangular welding groove 38, the entire conveying process of the battery cell is carried out in the form of negative pressure, so that the battery cell will not be offset during the conveying process, thereby ensuring the loading accuracy of the battery cell. Specifically, the battery cell is placed regularly through the rectangular material frame 48. On one side of the conveying plate 34, the moving position of the lead screw slide 51 is positioned by the second mechanical limit block 60, so that the negative pressure loading pipe 49 can accurately place the battery cell on the loading station of the conveying plate 34, and the first negative pressure pump 56 is used to make the conveying plate 34 generate negative pressure to adsorb the battery cell, ensuring that the conveying plate 34 will not deviate during the movement of the conveying plate 34. When the conveying plate 34 conveys the frontmost battery cell to the top of the rectangular welding table 37, the first vertical lifting rod 35 and the second vertical lifting rod 39 rise to lift the battery cell. The first vertical lifting rod 35 and the second vertical lifting rod 39 first contact the battery cell and The battery cells are adsorbed by means of negative pressure, and then the conveying plate 34 disconnects the negative pressure, and then the first vertical lifting rod 35 and the second vertical lifting rod 39 lift the battery cells upward and separate them from the conveying plate 34. After the conveying plate 34 is reset, the first vertical lifting rod 35 and the second vertical lifting rod 39 move downward and reset, and the second vertical lifting rod 39 accurately places the battery cells in the rectangular welding groove 38, and the first vertical lifting rod 35 places the battery cells on the conveying plate 34. The conveying plate 34 generates negative pressure to adsorb the battery cells, thereby limiting the negative pressure adsorption of the battery cells during the entire process, ensuring accurate loading and improving welding quality.

[0050] In the description of the present invention, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "two ends", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention; and it is known to those skilled in the art that the beneficial effect to be achieved by the present invention is only to achieve better beneficial effects compared with the current implementation scheme in the prior art under specific circumstances, rather than to directly achieve the best use effect in the industry.

[0051] The foregoing description is merely a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein and should not be construed as excluding other embodiments. Rather, the present invention can be used in various other combinations, modifications, and environments and can be modified within the scope of the concept described herein through the above teachings or techniques or knowledge in the relevant field. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention are intended to be protected by the appended claims.

Claims

1. A photovoltaic server cell front single welding system, characterized in that: The invention comprises a circular welding table (1) which is arranged to rotate, wherein a plurality of welding stations are arranged on the top surface of the circular welding table (1), and the plurality of welding stations are evenly distributed along the circumferential direction of the circular welding table (1), and the circular welding table (1) is provided with a welding strip feeding mechanism and a welding strip welding mechanism in sequence along its own rotation direction, wherein the welding strip feeding mechanism comprises a welding strip feeding box (3) and a limiting bearing plate (4), wherein the welding strip feeding box (3) is located directly above the welding stations, and a plurality of welding strip feeding cavities (5) are provided at equal intervals on the bottom of the welding strip feeding box (3), and tinned copper welding strips are stacked in sequence along the height direction of the welding strip feeding box (3). In the solder strip feeding cavity (5), a plurality of the solder strip feeding cavities (5) correspond one to one with the main grid lines on the front of the battery cell, the solder strip feeding box (3) has the freedom to move axially along the circular welding platform (1) and the freedom to move horizontally, the horizontal freedom of the solder strip feeding box (3) is parallel to the length direction of the main grid lines, and one end of each of the solder strip feeding cavities (5) is provided with the limiting bearing plate (4), the limiting bearing plate (4) is contacted with the bottom of the solder strip feeding box (3), and the limiting bearing plate (4) has the freedom to move axially along the circular welding platform (1); The welding ribbon welding mechanism comprises a welding seat (6), the welding seat (6) is located directly above the welding station, a plurality of welding bosses (7) are provided at the bottom of the welding seat (6), the plurality of welding bosses (7) correspond one-to-one to a plurality of main grid lines on the battery cell, and an electric heating wire is provided in the welding bosses (7).

2. A photovoltaic server cell front side single welding system according to claim 1, characterized in that: The welding strip feeding mechanism further comprises a feeding frame (2), a vertical cylinder (8) and a horizontal cylinder (9); the feeding frame (2) is located on one side of the circular welding table (1); a top plate (10) is fixed on the feeding frame (2); the cylinder body of the vertical cylinder (8) is mounted on the top plate (10); an inverted T-shaped block (11) is fixed to the telescopic shaft of the vertical cylinder (8); an inverted T-shaped groove (12) is provided on the top of the welding strip feeding box (3) along the telescopic direction of the horizontal cylinder (9); the inverted T-shaped block (11) is slidably fitted in the inverted T-shaped groove (12); A T-shaped slide rail (13) is vertically fixed, and a slide seat (14) is slidably adapted on the T-shaped slide rail (13). The cylinder body of the horizontal cylinder (9) is installed on the slide seat (14). The telescopic shaft of the horizontal cylinder (9) is connected to a mounting plate (15). The mounting plate (15) is connected to the welding strip loading box (3) by bolts. The welding strip welding mechanism also includes a welding frame (16). A welding cylinder (17) is vertically installed on the welding frame (16). The telescopic shaft of the welding cylinder (17) is connected to a mounting plate (18). The mounting plate (18) is connected to the welding seat (6) by welding bolts.

3. A photovoltaic server cell front side single welding system according to claim 2, characterized in that: The two inner walls of the welding strip feeding cavity (5) in the longitudinal direction are both slidably provided with a bearing plate (19), and the bearing plate (19) moves along the longitudinal direction of the welding strip feeding cavity (5). The side walls at both ends of the welding strip feeding box (3) are fixed with a driving block (20), and a driving cavity (21) is provided in the driving block (20). One end of the bearing plate (19) is movably inserted into the driving cavity (21) and is fixedly sleeved with a spring mounting plate (22), and an electromagnetic Iron (23), a permanent magnet (24) is fixed to one end of the carrier plate (19) close to the electromagnet (23), and the electromagnet (23) generates a magnetic pole opposite to the magnetic pole of the permanent magnet (24) when energized, and a spring (25) is sleeved on the carrier plate (19), and the two ends of the spring (25) are respectively connected to the spring mounting plate (22) and the driving block (20), and when the spring (25) is in a normal state, the other end of the carrier plate (19) extends into the welding strip feeding cavity (5).

4. A photovoltaic server cell front side single welding system according to claim 3, characterized in that: The top surface of the position-limiting bearing plate (4) is provided with a rectangular groove (26), and a lifting plate (27) is slidably arranged in the rectangular groove (26). The bottom of the lifting block (27) is connected to the position-limiting bearing plate (4) through a lifting spring (28). When the lifting spring (28) is in a normal state, the top surface of the lifting plate (27) is flush with the top surface of the position-limiting bearing plate (4). The bottom wall of the rectangular groove (26) is provided with a lifting electromagnet (29). A lifting permanent magnet (30) is fixed to the bottom of the lifting plate (27). When the lifting electromagnet (29) is energized, it generates a magnetic pole with the same magnetic property as the lifting permanent magnet (30).

5. The photovoltaic server cell front side single welding system according to claim 4, characterized in that: The ends of the plurality of limiting bearing plates (4) away from the welding strip loading box (3) are connected via a cross bar (31), a 7-shaped plate (32) is fixed in the middle of the cross bar (31), and the top of the 7-shaped plate (32) is fixedly sleeved on the telescopic shaft of the vertical cylinder (8).

6. The photovoltaic server cell front side single welding system according to claim 1, characterized in that: The invention also includes a reciprocating feeding mechanism and a reciprocating unloading mechanism. The reciprocating feeding mechanism, the welding strip feeding mechanism, the welding strip welding mechanism and the reciprocating unloading mechanism are arranged in sequence along the rotation direction of the circular welding table (1). The reciprocating feeding mechanism has the same structure as the reciprocating unloading mechanism, but the conveying direction is opposite. The reciprocating feeding mechanism includes a conveying table (33), a conveying plate (34), a first vertical lifting rod (35) and an unloading mechanism. The conveying table (33) is arranged on one side of the circular welding table (1). The conveying plate (34) is slidably arranged on the conveying table (33). The conveying plate (34) moves along the radial direction of the circular welding table (1). The top surface of the conveying plate (34) is provided with a plurality of battery cell placement stations at equal intervals along its own length direction. The end of the conveying plate (34) is provided with a feeding station. There is a gap between the feeding station and the nearest battery cell placement station. The spacing is equal to the spacing between two adjacent battery cell placement stations, the loading and unloading mechanism is provided on one side of the loading station, each battery cell placement station is correspondingly provided with the first vertical lifting rod (35), the first vertical lifting rod (35) is slidably provided on the conveying platform (33), the first vertical lifting rod (35) moves along the axial direction of the circular welding platform (1), the conveying plate (34) is provided with a strip groove (36) for the first vertical lifting rod (35) to pass through, the circular welding platform (1) is fixed with a rectangular welding platform (37) at the welding station, the top surface of the rectangular welding platform (37) is provided with a rectangular welding groove (38), a plurality of the second vertical lifting rods (39) are slidably provided in the rectangular welding groove (38), and the plurality of the second vertical lifting rods (39) are evenly distributed on both sides of the conveying plate (34).

7. A photovoltaic server cell front side single welding system according to claim 6, characterized in that: On both sides of the top of the conveying table (33), driving mounting plates (40) are fixedly arranged. Inside the driving mounting plates (40), rodless cylinders (41) are installed. Both sides of the conveying plate (34) are respectively fixedly connected to the cylinder sliders of the two rodless cylinders (41). At both ends of the cylinder slider of the rodless cylinder (41), first mechanical limit blocks (42) are arranged. A cavity is arranged inside the conveying table (33). Inside the cavity, a driving cross plate (43) is arranged. The bottom end of the first vertical lifting rod (35) is fixedly connected to the driving cross plate (43). Inside the cavity, a first lifting cylinder (44) is arranged. The cylinder body of the first lifting cylinder (44) is installed on the conveying table (33). The telescopic shaft of the first lifting cylinder (44) is connected to the driving cross plate (43). Under each rectangular welding table (37) of the circular welding table (1), a lifting cavity is arranged. Inside the lifting cavity, a rectangular lifting plate (45) is arranged. The bottom end of the second vertical lifting rod (39) is fixedly connected to the rectangular lifting plate (45). Inside the lifting cavity, a second lifting cylinder (46) is vertically arranged. The cylinder body of the second lifting cylinder (46) is connected to the circular welding table (1). The telescopic shaft of the second lifting cylinder (46) is connected to the rectangular lifting plate (45).

8. The photovoltaic server cell front side single welding system according to claim 7, characterized in that: The loading and unloading mechanism includes a gantry (47), a rectangular material frame (48) and a negative pressure feeding pipe (49). The gantry (47) is in the shape of a '冂' character. The conveying table (33) and the rectangular material frame (48) are both located inside the opening of the gantry (47). A lead screw (50) is rotatably connected to the gantry (47). The lead screw (50) is perpendicular to the conveying table (33). A lead screw slider (51) is threadedly sleeved on the lead screw (50). The lead screw slider (51) is in sliding contact with the gantry (47). Two second mechanical limit blocks (60) are fixedly arranged on the gantry (47) at intervals. The lead screw slider (51) is located between the two second mechanical limit blocks (60). The second mechanical limit blocks (60) are located on the moving path of the lead screw slider (51). A feeding cylinder (52) is vertically arranged at the bottom of the lead screw slider (51). The telescopic shaft of the feeding cylinder (52) is connected to the negative pressure feeding pipe (49). A motor (53) is arranged on the gantry (47). The output shaft of the motor (53) is drivingly connected to the lead screw (50). A rectangular stacking groove is formed at the top of the rectangular material frame (48). The photovoltaic cells are stacked in the rectangular stacking groove along the height direction of the rectangular material frame (48). A lifting bottom plate (55) is arranged inside the rectangular stacking groove. A linear driving module (54) is vertically arranged on the outer wall of the rectangular material frame (48). The linear slider of the linear driving module (54) is connected to the lifting bottom plate (55) through a connecting rod (66).

9. A photovoltaic server cell front side single welding system according to claim 8, characterized in that: The first vertical lifting rod (35) and the second vertical lifting rod (39) are both hollow, a first negative pressure pump (56) is arranged in the cavity, the first vertical lifting rod (35) is connected to the first negative pressure pump (56) through a first air pipe (57), a negative pressure cavity is arranged in the conveying plate (34), a plurality of negative pressure holes (67) are evenly opened on the top surface of the conveying plate (34) along its own length direction, the negative pressure holes (67) are connected to the negative pressure cavity, the conveying plate (34) is connected to the first negative pressure pump (56) through a negative pressure hose (68), the negative pressure hose (68) is connected to the negative pressure cavity, and a negative pressure hole (67) is arranged in the lifting cavity. There is a second negative pressure pump (58), and the second vertical lifting rod (39) is connected to the second negative pressure pump (58) through a second air pipe (59); a main shaft (61) is coaxially fixed to the bottom of the circular welding table (1), and the main shaft (61) is rotatably connected to a base (62) at one end away from the circular welding table (1), and a main driving cavity is provided in the base (62), and a stepping motor (63) is provided in the main driving cavity, and an output shaft of the stepping motor (63) is provided with a first gear (64), and a second gear (65) is mounted on the main shaft (61), and the second gear (65) engages with the first gear (64).

10. A method for single front welding of solar cells of a photovoltaic server, using the single front welding system of solar cells of a photovoltaic server according to claim 9, characterized in that: The following steps are involved: S1. Load the battery cells to the welding station through the reciprocating loading mechanism; S2, the welding station carrying the battery cell moves to the station of the welding ribbon loading mechanism; S3, the soldering ribbon loading box (3) moves close to the battery cell, and the soldering ribbon loading cavity (5) places the tinned copper soldering ribbon under the main grid line of the battery cell; S4, after the tinned copper welding strip is placed, it moves to the welding strip welding mechanism; S5. The welding seat (6) is moved close to the battery cell, and the welding boss (7) is brought into contact with each tinned copper soldering strip. The tinned copper soldering strip and the battery cell are heated by the electric heating wire in the welding boss (7), so that the tin on the tinned copper soldering strip is melted and condensed on the battery cell, completing the welding operation.

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